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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e68948e459edc6d1624fde6ff08c896352b73796a0a3f4a8c7d46d1e960cdfea' 
  AND token = 'CsNUoItG0ot89xBEIvOyfykn7YrrH1hezjrD4srJE1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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