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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd7c58a697bfa916db0d25b9646d94d6981dc02f28c8466de73c74d95320bf9e' 
  AND token = 'Te/5Se6TWTq1fLYQwB88QEprNjW+y1+ey3LjRmWl8Os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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