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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e0b694ab32b9bf346a6b8f75142c24d991974925c8c2985b15b1bc47e27bf76' 
  AND token = 'ZhbuOyLGAOKb8YFYot+aPHnep5FdlIog3ViwsxaNi5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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