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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6904a61820ff45fad5bfeca011afc1021a864282337feb9c0a5e6456dc1ce4c8' 
  AND token = '4BiQDeR2MA84bPSUT9cWyuPj4XKNd3xJkarD6z59zx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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