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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72796beabe97e724a3b24e189a530cd7430505db452031fa9899c32d08dd7850' 
  AND token = 'nirIKNlujv82AkXbQInDuwnuqzGTf8W1jU32UNQP9/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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