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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '456bb99afd5cd66edbfbb185a06d28b9a564e4b14650680e50bc9d0683ee8a90' 
  AND token = '5h22K7pCzOZJST2YBBYN5gqGKn2J3d9K0+F2pqNNkF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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