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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46f35987926d6a32efc122444278cd4bbb225b0ba2ba25c5d1b5ce75b35e79ae' 
  AND token = 'ABL0Ck2bUeTj9FDyIX5tj9BL2zTxbZISFONwpJYpauY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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