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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41f0a6ec06a120173b5ea068fef2c267b72086f29ee65e56413b8722d51fe64f' 
  AND token = 'v0BSCuSP/T8uiCWaodvOfsGxPC4BjVHnGm6M0mAJn0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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