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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '664fe9eb5eeca0aaa519aab41009034e45c64a1b9a217900bffc98a59fed2845' 
  AND token = 'v8EFoderw8RdFDiy/Uz/DiTftTkxXzsiI24R6EoQSO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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