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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c054242f746bf8147cd132e1a58a7f89c03878c038320f9e3d8a954fda13bf7' 
  AND token = 'c9ex1EW2Lagl+c35jP76/zMNnTm39pq7ZBGBT10gPUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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