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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15319d76a270ffc2eec482cfaa5e46bee0e5a96e34c193eb9ec40746ea9c7b03' 
  AND token = 'ahN2vcyiuXZOBDrZ9kg4Hl+2R+f4zmUHa3Pwv5jIaFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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