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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8fc302d2cf34c13eb95e111e8bc65c272c27a1d8e266196a6194c31db17cafe' 
  AND token = 'Q0S7sdje9HCt6Eb5ENxZgYgb849nKl6pAkhZ6q55ZD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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