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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4065bf455f7b2ccef3961fc97f93d4c28feebdd6598b4ddc8e460a55172d01c' 
  AND token = 'UsZeiA/Yf8vDucRZRY7bc0FX+XYtRINPcMzRnT7l/vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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