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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '032f657de37ee4928284ff04ed506fd866c0a9c518072fd2b93f8cd0d7f95323' 
  AND token = 'miGYPEEdKjtl49LqxMt4yZBGsx3neHkfe4lvI4AmVwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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