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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef03fcec65b609c5de30acff5c8b2ed62ab7ed98b3b8abd12402d1cdc08fcce9' 
  AND token = 'PdyxaN/P9qMZCDkj3bosQp0KjtjwqhBECHnXr/GovE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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