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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91c4926103a3cac9e1c080a06e5192eaec6895c7bafb3c20c451650e447a28d3' 
  AND token = '1ugCZzm1OKLD+DDYCz4Gt5GWlWQV+ut1cBZpLe6Lliw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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