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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a12c8cc7300f4a8ddac4903f69104218d88598b5f5cb07c75ac1b614f44599e' 
  AND token = 'bbwVTLYzj2N5+eYVa/mp9oU89c+fA4JZl4XUhh1RXrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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