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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '952e41f2024aba820fa40e05f8ba255f5aeb994a6af163f69be6c363c4b62673' 
  AND token = '9xel6YuOi1Jx6l6oNNd2DhLXNDMQE88owBOKqSWS7t0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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