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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac98a8a09373bf8772db01d7afc016f80a7af1e79f63b9854f7b437d7c34da2a' 
  AND token = 'yGhFZLgEyN3K03txVpQ/eXKf5D4/HkcGoYtSpYWkwOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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