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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63d976eb215eb63ca92a4aa1b2d7a98eac96d82eb9eda4fd0c8c51681c779d09' 
  AND token = 'HqE2E1ZShiJ1EjB15/YX+Y2MHm8+SQ62BOEjIimgz/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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