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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fab697bee92abd739f4bc312b9aad507afe64474fe15d0f137c8c8a2fb04f807' 
  AND token = 'WQuwPcLyXANjA9dBuuSmWSlIy0K5S7kVNH9hQxn8XpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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