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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c84393970f0eda28257f9224d6ef3f807ae3835548f5b3e583ea53295152fb31' 
  AND token = '6PdjiF+SymOox5YMuAt3qbpSfeUZXYdRd1OYpX1eGS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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