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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f387c8f597aa07e2a052547b0468a8558a359874112518d860fa266c841eef5d' 
  AND token = 'fARbXprReepYzbWhvkbOGqsduUj/+yo77bU19h2lueE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00585

JSON explain

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