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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac36426e810b6a3bd381381fe014e3fbf992e7e47e445c0904cedcb830f3c556' 
  AND token = 'wPLwxTuxHE44ku241hqPo7wiSoi6LxsC57QGYY5ren8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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