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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b12cde61d9a382f6fc41b98f8bb30e0a9882ecdbb428d400dcaad3f157dd848' 
  AND token = 'UlXv7JP5s/tdXVmn4AkIeeohUgFA7FYYO6iM4W2Ludg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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