SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0206763d57e5a7bdd4e966358b759307d1b160f73fd2eea40f5fb107edd2c19' 
  AND token = 'w8O6zp2jnMPsqwMAsyUF/vKsuMGBODggFHUenSDIv+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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