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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24959e03fb7b2c32bbb3bc47e049f9868d875550f5e5e1043f1253250aeaf2c6' 
  AND token = 'uMYFD2KYUlQgFsNk9j7hTpQjjG03TxEJ7uaS6Lb3Eek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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