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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9569d7190a0d59bb4a5dc0d6ec72ca52e04a0c9e602d42339ae492800c0b1278' 
  AND token = 'cWGazCjDlzzbKTFX1E/6GpGZJiTawCsygcTh8werljg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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