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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40ebe86593231c8d2318476b91c92ea910f6af94e4884e300349a431f7a29a73' 
  AND token = 'lwHifOh5ASGMTPWrfe54O49g4EyjMNW+AevMiG9xZtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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