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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e689a0a62bc5008a85e76b67c5678bfbabb7987cbd150aec770b91c39fe7b94c' 
  AND token = '5q4KvV7oROoaC7ZKRILUj7qO30AJZW7D65tGQx5xXT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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