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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0234b4695a74229a199d18ce0a72a255e42e809bf9ca871af2e370d36a9ff114' 
  AND token = 'NicZhXzIma8bel8ylu+cs6rQe27FEs0Z0cO954nSt1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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