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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e95a60af17d1fddc75f962853ad752a4e01e3e42dba77a57c0813e2b6eef8874' 
  AND token = 'PQ0pVQXompB5QYheMEVyDLJqxa9rreYOcusX9ZIUE+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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