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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97ca1ffac4b070e6cb938b669c8a1c5d3ecd0e76a713bd844a1172f00b78335f' 
  AND token = 'jwrjDTGqHQd+aG6ThJ/C/uRC5ejTyrUCUNpiPT/0Dvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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