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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5bba1073742408bfc23a9a228649dea44b28f8dd94f73d14cbc754d3fa2ab70' 
  AND token = 'AtNjHQdhEnN8mT3cV9iZkZS8Rhc6jsDl/Dy3uDzj5n4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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