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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b93ff6aa6ea7277f0c5609f1e7335bb1f98162c5287aaa9cf01c899dea6bbf03' 
  AND token = 'qGHa6LC4RiKaSVn5Yp17IIzXjn2y5Bn1I6JpiuyzwBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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