SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a734bf37fe17e913dd61c4b188002f5a0b0067599eca20ac042b5dcef28712d8' 
  AND token = 'wsXujRwobija7rMnyhzU2H1OH5xwFGawzAvY+pDDp+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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