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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7629bcd7497f439fe9a16c7f39e3d88d5f62323ec060dce3a17e0f2a82b4c3e1' 
  AND token = 'tbck74xH79FMEheJldhgXsfGo0PhUUHc0NjfMdZ7emk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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