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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f1e18eff7100b641910d351885654b8d7efb7f04d99b053f6ec9c4ca9891756' 
  AND token = 'POPasjeJhxsFrI824J0L/ETLPagbGUSLjzbAA0gNItU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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