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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56677ae8379c625f905144c265530803776caf886c36a9c445a547622d0f3d26' 
  AND token = 'Ze/tYCU0kHxS8NowqE8A2p2+31ueLFz4+tbJO+wX7O8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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