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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e09ed47c37f7c480b2b71cd2b97312eee8d3205b2d3105346d0e65cb2a6d934' 
  AND token = 'b7oqfJbguvzleoZgVIrBGq3+OvJorUncgJJEPBaOzRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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