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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd04535b324fca6000c3e5385c7b5f3cd66216693a1f742ab462e7b6221501823' 
  AND token = 'yxFbicZ0fbwzIRScHJ1vq+MNSlxswtYFNUUzIr+c+B8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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