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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a59afeb3fb8e2b9eb9a94f08e7c633506550c496b3ed5709a5d9b326798a414' 
  AND token = '73XiiJV3awcclgnssTQ8IiVlLGz9vk0Nsv3vTfUT7a8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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