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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '719b8e3b070e326fd15dab0845ac68d790367cba8c67d3bce1d76bf3ba9d9559' 
  AND token = 'WZ69a5SPziQeTEWLx3t412IuY9pU0vv3dXISdPsi3hU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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