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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7138e69a42708d078c74dfee0a4d3c9bff2900b51d2ef136c2fd02bbab8e7c04' 
  AND token = 'MV4WpRyipzKAG72fCLk0xi+X06aDCMF0hVNN0kfcmNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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