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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '824284e5e6c1b5f123582d5cf77d17fd5f11220bf96b42347e631f0a7e836007' 
  AND token = 'jEAvWHeKsf0q5U+7erL6f7IA9t20z2TjFL7IX2xtSc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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