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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81f184c9a73fadb0f2ea7a936dfc266885bd94e5705fef8db34733462586ab7d' 
  AND token = 'RkeliWzlgDFQHfho0DhJor9JpU3T9o0yiYBheI1RHgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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