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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '131e2671f8db4058259718c8b1412815b8f041a56db63f7aa9c7d0c0748d5fd8' 
  AND token = 'ae9bkZOgA9EvTrTyd+3rQZyxQJ8DnVPc4UvhXNB7wPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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