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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc5158507b75f4646c5ee1d39fd86f5f08629b0dc62fce025eeabce6a64d35a9' 
  AND token = 'erJeCA5lGm9z7Kjh00g2uBlpB1zKZctdlpe14okFBT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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