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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7cc2e6b1403bb1d2dff5c6bfe81f5c920d297c29bb1ca840ad2b81ff22558a4' 
  AND token = 'vserk3BMukDHbcZ1Hf4l1KnQH8aH7TUiS6arxWT1qSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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