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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f60d50cad7a2333cba6dcf7d86c08b38ee3d94bfbd3d354f1b3775db37fb4cd' 
  AND token = '2Loacfn/1U9bBPU1wpe12G+FStJpq0RAvEipy44FS/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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