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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f26b80cb7e2b7550434a7805309edadd3781be9d5d51631c9b1fc10d1e0f5c96' 
  AND token = 'Xz1JACsfYg/L7K2zJ06r+O6dU9lRsF+v4RYl81OBztk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01123

JSON explain

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