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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd34d3794c47680ef8f9b62809b3683e3d837ce5330c95cc8181af9ce64a135a7' 
  AND token = 'RQ8aJcj0GRAvmy0cbChVCGW/94NqJU04Vmf3WmPZxlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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