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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9173376ab2716aff355b1c594d8fada3a24ec023debbc85492c79f49588d9b9' 
  AND token = 'BUrzCrj7Wk+PaDeN5Bdyd5q9XtTF0nUdcPw/a5i8kMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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