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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bbf80817b7bd3387f92c39faddcdf61fa3b8131bc8748528d885010ce611eaa' 
  AND token = '57tju/7AoA5c/rqWzJOlHnXBTEbPodkM6Camf8qcxWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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