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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da47e5d14c4de6c0ba39904c15947698258ff0dba0e835cf76482a89a3c89bbe' 
  AND token = 'CfhPSz86vh1qzYV8fWeXuo3EcFKfAFFrtBfN0dEf1As=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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