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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '247aa43bb9b6f404fac66a6342ff9f2d1df75c2d2224d2d8ea1126a9a68df241' 
  AND token = 'b8KkL6jiL5cjRGJdvvUw4PmFpqkS691Y0Sh6rjtBnEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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