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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc6abafb01a9dbaa705242273eda6887af81c6909c2e7ed5cc67db664b9a3fbe' 
  AND token = 'gAjyPHLE0/f8vkocYfc9zHgUXKM83WR+a01X6lfYqjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}