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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fdfd1b4e206a24b40cde89aae7e45e73c53a4dd7ad5e2a63e3818425d6dc102' 
  AND token = 'CQpbzPuPQg4EqV/Y1yFF+I15yh6cFuQcR2UoFbUDrGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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