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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66b2ac48f867f54b5c515079fddef7e82acb056e9b9a04858a2407e97d838f95' 
  AND token = 'adHTwdbcZwLIFKiidUJgmfZLu0bZ2/Ok7p/sDjxV3NU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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