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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0d8c76a35cd7febc5f93098f239e827d4ab46183217c8d7c49a74216d361276' 
  AND token = 'wOgbrSL7U7YUqfdy9RIF2lNSs/FuqjejjGenyB0RD/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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