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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c2ffde9658fce8aaf4e4d6210136346f6e05d04efebb5973a5a9580aead34be' 
  AND token = 'WPcPWd7ClJSj1t5OolxGZ6n6QkfM9PnTJNFzccNj02k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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