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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f94b79afab287869cf2d22c5e13b37127cb53c1f9a9f331f1cb63c2f879e2bb7' 
  AND token = '25dfaaW5PgTXh5jkh7mU67HDQ//0ot9TCCAcojVrEWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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