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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5495360b0c6f8e5112891b80b1afb61772b6b28ebb9ba6271de22b1cd0622ce' 
  AND token = 'g8hYA49oMFnLDLIFSugCNcXHjTAhcW6cFb36Z80bYS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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