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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2ca80c064a740b25f57d09df437a9a6eaa0e3b55800854068ca56ef827a1efd' 
  AND token = 'MF/7zQPkxIbTN3XS0bURYsqc9wUvCCGMKHbOd97aFFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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